package com.blog.controller;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.blog.utils.ConstantUtil;
import com.opensymphony.xwork2.ActionSupport;

public class VcodeAction extends ActionSupport {
	private static final long serialVersionUID = -6892081227463287145L;

	public String execute() throws IOException {
		HttpServletRequest request = ServletActionContext.getRequest();
		HttpServletResponse response = ServletActionContext.getResponse();
		// 设置返回格式
		response.setContentType("image/jpeg");
		// 清空缓存
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);
		HttpSession session = request.getSession();
		// 设置宽度
		int width = 60, height = 20;
		BufferedImage bi = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_BGR);
		Graphics g = bi.getGraphics();

		Random random = new Random();
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}

		String sRand = "";
		for (int i = 0; i < 4; i++) {
			// String rand = String.valueOf(random.nextInt(10));
			int n = random.nextInt(ConstantUtil.STRING_CODE.length());
			String rand = ConstantUtil.STRING_CODE.substring(n, n + 1);

			sRand += rand;
			// sRand += rand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(rand, 13 * i + 6, 16);
		}
		session.setAttribute(ConstantUtil.V_CODE, sRand);
		g.dispose();
		ServletOutputStream responseOutputStream = response.getOutputStream();
		ImageIO.write(bi, "JPEG", responseOutputStream);
		responseOutputStream.flush();
		responseOutputStream.close();
		return null;
	}

	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
}
